Tonometry2012
Tonometry2012 Tonometry2012
Goldmann applanation tonometry •Applanation tonometry measures the force required to flatten a known area (diameter = 3.06 mm) of the cornea •The eye is not a perfect sphere, but the resistance of the average cornea to deformation is balanced by the attractive force of the tear film. •Corneas that are much thicker or thinner than average will affect the reading, but Goldmann applanation remains the gold standard in clinical practice for physician ophthalmologists.
Goldmann applanation tonometry •Apply topical anesthetic and fluorescein •A cobalt blue filter is used to produce a blue light, and the tonometer prism is advanced until close to the cornea, then observed through the oculars of the slit lamp. •The hemi-circles produced by the prism are brought into alignment by the operator •When the inner edges of the hemi-circles are in contact, a circle of cornea 3.06mm in diameter is flattened (displacing ~0.5µl of aqueous humor), and 1gm of force corresponds to 10mmHg IOP, assuming an average corneal thickness.
- Page 1 and 2: Tonometry Gillian J. McLellan BVMS
- Page 3 and 4: Glaucoma ------------ 25 mm Hg Nor
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- Page 7 and 8: Clinical issues impacting tonometri
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- Page 17 and 18: ↓ Force ↑ Force Schiøtz - Prac
- Page 19 and 20: Maklakov Tonometer, First produced
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- Page 38 and 39: THE RELATIONSHIP BETWEEN CCT AND IO
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Goldmann applanation tonometry<br />
•Applanation tonometry measures the force required to flatten a known area<br />
(diameter = 3.06 mm) of the cornea<br />
•The eye is not a perfect sphere, but the resistance of the average cornea to<br />
deformation is balanced by the attractive force of the tear film.<br />
•Corneas that are much thicker or thinner than average will affect the reading, but<br />
Goldmann applanation remains the gold standard in clinical practice for physician<br />
ophthalmologists.
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